实验3

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<unistd.h>
#define N 80

void printText(int line,int col,char text[]);
void printSpaces(int n);
void printBlankLines(int n);

int main()
{
    int line,col,i;
    char text[N]="hi,May~";
    
    srand(time(0));
    
    for(i=1;i<=10;++i)
    {
        line=rand()%25;
        col=rand()%80;
        printText(line,col,text);
        sleep(1);
    }
    return 0;
}

void printSpaces(int n)
{
    int i;
    for(i=1;i<=n;++i)
        printf(" ");
}

void printBlankLines(int n)
{
    int i;
    for(i=1;i<=n;++i)
        printf("\n");
}

void printText(int line,int col,char text[])
{
    printBlankLines(line-1);
    printSpaces(col-1);
    printf("%s",text);
}

#include<stdio.h>
long long fac(int n);

int main()
{
    int i,n;
    
    printf("Enter n: ");
    scanf("%d",&n);
    
    for(i=1;i<=n;++i)
        printf("%d!=%lld\n",i,fac(i));
    
    return 0;
}

long long fac(int n)
{
    static long long p=1;
    p=p*n;
    return p;
}

#include<stdio.h>
int func(int,int);

int main()
{
    int k=4,m=1,p1,p2;
    
    p1=func(k,m);
    p2=func(k,m);
    printf("%d,%d\n",p1,p2);
    
    return 0;
}

int func(int a,int b)
{
    static int m=0,i=2;
    i+=m+1;
    m=i+a+b;
    
    return m;
}

结束后保留原值

#include<stdio.h>
long long fun(int n);

int main()
{
    int n;
    long long f;
    
    while(scanf("%d",&n)!=EOF)
    {
        f=fun(n);
        printf("n=%d,f=%lld\n",n,f);
    }
    
    return 0;
}

long long fun(int n)
{
    long long result;
    if(n==0)
        result=0;
    else
        result=2*fun(n-1)+1;
    return result;
}

#include<stdio.h>
void hanoi(unsigned int n,char from,char temp,char to);
void moveplate(unsigned int n,char from,char to);
extern int m;

int main()
{
    int n;
    while(scanf("%u",&n)!=EOF)
    {
        m=0;
        hanoi(n,'A','B','C');
        printf("\n一共移动了%d次\n\n",m);
    }
    return 0;
}
    
int m;

void hanoi(unsigned int n,char from,char temp,char to)
{
    if(n==1)
        moveplate(n,from,to);
    else
    {
        hanoi(n-1,from,to,temp);
        moveplate(n,from,to);
        hanoi(n-1,temp,from,to);
    }
}

void moveplate(unsigned int n,char from,char to)
{
    printf("第%u个盘子:%c-->%c\n",n,from,to);
    m++;
}

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
int is_prime(int n);
int main()
{
    int m,j;
    for (m = 4; m <= 20; ++m)
    {
        if (m % 2 != 0)
            continue;
        else
        {
            for (j = 2; j < m - 1; ++j)
            {
                if (is_prime(j) && is_prime(m - j))
                {
                    printf("%d=%d+%d\n", m, j, m - j);
                    break;
                }
            }
        }
    }
    return 0;
}
int is_prime(int n)
{
    int i;
    if (n == 0 || n == 1)
        return 0;
    else
    {
        for (i = 2; i < n - 1; ++i)

        {
            if (n % i != 0)
                return 1; break;
        }
        while (i == n - 1)
            return 0;
    }
}

#include<stdio.h>
long fun(long s);

int main()
{
    long s,t;
    printf("Enter a number: ");
    while(scanf("%ld",&s)!=EOF)
    {
        t=fun(s);
        printf("new number is:%ld\n\n",t);
        printf("Enter a number: ");
    }
    return 0;
}

long fun(long s)
{
    long i,p=0,n=1;
    while(s!=0)
    {
        i=s%10;
        if(i%2!=0)
        {
            p=n*i+p;
            n*=10;
        }
        s=s/10;
    }
    return p;
}